[Harmless Teddy Bear]

you also need barracks for troops, art that celebrates martial prowess, tales about the same.

Nope, nope and how do you know?

The barracks are not needed and a number of civilizations had a warrior culture with out them. Art is not necessary and since you can not read the language how do you know there are no tales of martial prowess? What script you have could be a list of body parts chopped off or a recipe on how to make soup with the hearts of your enemies.

[Cronos]

#1 Which culture did not need barracks for troops? I'm asking as I genuinely don't know

#2 Art is there in every culture - even the Harappan - and they do not depict war. Every other civilized (city based) culture depicts war

#3 tales yes - because the tales of Harappa are the pre-Vedic Indic tales that one can find in the Tamil Sangam or the Puranas

[gleeaikin]

Here are many images regarding Harappa and Mohenjo-Daro. See what you can find that seems to answer your military questions etc.

https://www.google.com/search?q=images+of+harappa+and+mohenjo+daro&num=50&newwindow=1&safe=off&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiy_MvqnrPaAhUJ61MKHXnvAkQQsAQIKA&biw=1600&bih=794